Interestingly enough, the article on Geek n Sundry talking about it says "Members will get first access to new episodes before anyone else."

And the video announcement specifically says "watch it first on ProjectAlpha.com"

So to continue with, yet more speculation. I get the impression it'll be somewhere else at a later date, they're just not saying where yet, to try and get people interested in Alpha.

After all if that's not the case, why say watch it "first" on Alpha, or mention that members get access to it before anyone else, since if it's alpha exclusive, they don't get access to it before anyone else since...well no one else gets access to it anyways.